8 February 2002 Improvement of instrument line shape of IMG
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The interferometric Monitor for Greenhouse gases (IMG) measured the high-resolution infrared spectra emitted from Earth from October 1996 to June 1997. It is a Fourier Transform Spectrometer based on the Michelson interferometer achieving 0.05 cm-1 wavenumber resolution and covers between 660 cm-1 and 3030 cm-1 with three infrared detectors. Since detectors are large and are not located in the center of the field of view (FOV), the instrument line shape (ILS) is shifted and widened. In this paper, we describe the ILS theoretical model and evaluate it by comparing the synthesized spectrum with the IMG observed spectrum. We checked the improvement of ILS by the FOV geometry. The retrieval accuracy will be improved by using this ILS model in the retrieval program.
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Shunsuke Ichizawa, Kayoko Kondo, Makoto Suzuki, Haruhisa Shimoda, and Toshihiro Ogawa "Improvement of instrument line shape of IMG", Proc. SPIE 4486, Infrared Spaceborne Remote Sensing IX, (8 February 2002); doi: 10.1117/12.455114; https://doi.org/10.1117/12.455114

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